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The shape alignment of satellite galaxies in Local Group-like pairs from the SDSS
Wang, Peng1,2; Guo, Quan3; Libeskind, Noam I.2,4; Tempel, Elmo2,5; Wei, Chengliang1; Kang, Xi1
2019-04-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume484Issue:3Pages:4325-4336
Corresponding AuthorWang, Peng(wangpeng@pmo.ac.cn)
AbstractIt has been shown, both in simulations and observationally, that the tidal field of a large galaxy can torque its satellites such that the major axis of satellite galaxies points towards their hosts. This so-called 'shape alignment' has been observed in isolated Milky Way-like galaxies but not in 'Local Group'-like pairs. In this study, we investigate the shape alignment of satellite galaxies in galaxy pairs similar to the Local Group identified in the Sloan Digital Sky Survey Data Release 13 (SDSS DR13). By stacking tens of thousands of satellite galaxies around primary galaxy pairs, we find two statistically strong alignment signals. (1) The major axes of satellite galaxies located in the (projected) area between two primaries (the facing region) tend to be perpendicular to the line connecting the satellite to its host (tangential alignment), while (2) the major axes of satellite galaxies located in regions away from the other host (the away region) tend to be aligned with the line connecting the satellite to its host (radial alignment). These alignments are confirmed at similar to 5 sigma levels. The alignment signal increases with increasing primary brightness, decreasing pair separation, and decreasing satellite distance. The alignment signal is also found to be stronger in filamentary environments. These findings will shed light on understanding the mechanisms of how satellite galaxies are affected by the tidal field in galaxy pairs and will be useful for investigating galaxy intrinsic alignment in the analyses of weak gravitational lensing.
Keywordgalaxies: dwarf galaxies: general galaxies: haloes Local Group cosmology: observations
DOI10.1093/mnras/stz285
WOS KeywordDIGITAL SKY SURVEY ; COSMOLOGICAL PARAMETER CONSTRAINTS ; ENHANCED STAR-FORMATION ; DARK-MATTER SUBHALOES ; RADIAL ALIGNMENT ; INTRINSIC ALIGNMENTS ; COSMIC WEB ; MILKY-WAY ; ANISOTROPIC DISTRIBUTION ; DENSITY PROFILES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000462410300106
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/24243
Collection中国科学院紫金山天文台
Corresponding AuthorWang, Peng
Affiliation1.PMO, 8 Yuan Hua Rd, Nanjing 2100342, Jiangsu, Peoples R China
2.Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany
3.Shanghai Astron Observ SHAO, Nandan Rd 80, Shanghai 200030, Peoples R China
4.UCB Lyon 1, Univ Lyon, CNRS, IN2P3,IPN Lyon, Lyon, France
5.Univ Tartu, Tartu Observ, Observ 1, EE-61602 Toravere, Estonia
Recommended Citation
GB/T 7714
Wang, Peng,Guo, Quan,Libeskind, Noam I.,et al. The shape alignment of satellite galaxies in Local Group-like pairs from the SDSS[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,484(3):4325-4336.
APA Wang, Peng,Guo, Quan,Libeskind, Noam I.,Tempel, Elmo,Wei, Chengliang,&Kang, Xi.(2019).The shape alignment of satellite galaxies in Local Group-like pairs from the SDSS.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,484(3),4325-4336.
MLA Wang, Peng,et al."The shape alignment of satellite galaxies in Local Group-like pairs from the SDSS".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 484.3(2019):4325-4336.
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